Similar to the donation machine the amount of coins donated will persist between all greed mode runs donating money to the greed donation machine unlocks achievements and items.
Is therea shop on the final floor of greed.
The final boss of the dark room will always be the lamb.
Up until the penultimate floor an already unlocked treasure room with a silver door frame and a normal locked treasure room are also available.
A super secret room is also connected to one of the rooms.
The greed donation machine appears after every ultra greed fight in greed mode or greedier mode upon touching the greed donation machine isaac will donate a coin causing the displayed coin total to increment.
Throughout the wasteland you cross bridges and fall down in deep ravines to reach to the castle.
Floor 5 desolate dunes.
In greed mode each floor has a curse room a devil room angel room a double wide shop and an exit room all connected to a main double height arena room with a button in the center.